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MindCreeper03
291
libraries/Adafruit_TouchScreen/TouchScreen.cpp
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291
libraries/Adafruit_TouchScreen/TouchScreen.cpp
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// Touch screen library with X Y and Z (pressure) readings as well
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// as oversampling to avoid 'bouncing'
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// (c) ladyada / adafruit
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// Code under MIT License
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#include "Arduino.h"
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#include "pins_arduino.h"
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#ifdef __AVR
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#include <avr/pgmspace.h>
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#elif defined(ESP8266)
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#include <pgmspace.h>
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#endif
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#include "TouchScreen.h"
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// increase or decrease the touchscreen oversampling. This is a little different
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// than you make think: 1 is no oversampling, whatever data we get is
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// immediately returned 2 is double-sampling and we only return valid data if
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// both points are the same 3+ uses insert sort to get the median value. We
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// found 2 is precise yet not too slow so we suggest sticking with it!
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#define NUMSAMPLES 2
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TSPoint::TSPoint(void) { x = y = z = 0; }
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/**
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* @brief Construct a new TSPoint::TSPoint object
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*
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* @param x0 The point's X value
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* @param y0 The point's Y value
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* @param z0 The point's Z value
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*/
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TSPoint::TSPoint(int16_t x0, int16_t y0, int16_t z0) {
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x = x0;
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y = y0;
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z = z0;
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}
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/**
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* @brief Check if the current point is equivalent to another point
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*
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* @param p1 The other point being checked for equivalence
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* @return `true` : the two points are equivalent
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* `false`: the two points are **not** equivalent
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*/
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bool TSPoint::operator==(TSPoint p1) {
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return ((p1.x == x) && (p1.y == y) && (p1.z == z));
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}
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/**
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* @brief Check if the current point is **not** equivalent to another point
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*
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* @param p1 The other point being checked for equivalence
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* @return `true` :the two points are **not** equivalent
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* `false`: the two points are equivalent
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*/
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bool TSPoint::operator!=(TSPoint p1) {
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return ((p1.x != x) || (p1.y != y) || (p1.z != z));
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}
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#if (NUMSAMPLES > 2)
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static void insert_sort(int array[], uint8_t size) {
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uint8_t j;
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int save;
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for (int i = 1; i < size; i++) {
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save = array[i];
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for (j = i; j >= 1 && save < array[j - 1]; j--)
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array[j] = array[j - 1];
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array[j] = save;
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}
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}
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#endif
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/**
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* @brief Measure the X, Y, and pressure and return a TSPoint with the
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* measurements
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*
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* @return TSPoint The measured X, Y, and Z/pressure values
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*/
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TSPoint TouchScreen::getPoint(void) {
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int x, y, z;
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int samples[NUMSAMPLES];
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uint8_t i, valid;
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valid = 1;
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pinMode(_yp, INPUT);
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pinMode(_ym, INPUT);
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pinMode(_xp, OUTPUT);
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pinMode(_xm, OUTPUT);
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#if defined(USE_FAST_PINIO)
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*xp_port |= xp_pin;
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*xm_port &= ~xm_pin;
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#else
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digitalWrite(_xp, HIGH);
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digitalWrite(_xm, LOW);
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#endif
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#ifdef __arm__
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delayMicroseconds(20); // Fast ARM chips need to allow voltages to settle
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#endif
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for (i = 0; i < NUMSAMPLES; i++) {
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samples[i] = analogRead(_yp);
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}
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#if NUMSAMPLES > 2
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insert_sort(samples, NUMSAMPLES);
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#endif
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#if NUMSAMPLES == 2
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// Allow small amount of measurement noise, because capacitive
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// coupling to a TFT display's signals can induce some noise.
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if (samples[0] - samples[1] < -4 || samples[0] - samples[1] > 4) {
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valid = 0;
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} else {
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samples[1] = (samples[0] + samples[1]) >> 1; // average 2 samples
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}
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#endif
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x = (1023 - samples[NUMSAMPLES / 2]);
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pinMode(_xp, INPUT);
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pinMode(_xm, INPUT);
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pinMode(_yp, OUTPUT);
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pinMode(_ym, OUTPUT);
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#if defined(USE_FAST_PINIO)
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*ym_port &= ~ym_pin;
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*yp_port |= yp_pin;
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#else
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digitalWrite(_ym, LOW);
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digitalWrite(_yp, HIGH);
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#endif
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#ifdef __arm__
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delayMicroseconds(20); // Fast ARM chips need to allow voltages to settle
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#endif
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for (i = 0; i < NUMSAMPLES; i++) {
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samples[i] = analogRead(_xm);
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}
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#if NUMSAMPLES > 2
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insert_sort(samples, NUMSAMPLES);
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#endif
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#if NUMSAMPLES == 2
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// Allow small amount of measurement noise, because capacitive
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// coupling to a TFT display's signals can induce some noise.
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if (samples[0] - samples[1] < -4 || samples[0] - samples[1] > 4) {
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valid = 0;
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} else {
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samples[1] = (samples[0] + samples[1]) >> 1; // average 2 samples
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}
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#endif
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y = (1023 - samples[NUMSAMPLES / 2]);
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// Set X+ to ground
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// Set Y- to VCC
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// Hi-Z X- and Y+
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pinMode(_xp, OUTPUT);
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pinMode(_yp, INPUT);
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#if defined(USE_FAST_PINIO)
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*xp_port &= ~xp_pin;
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*ym_port |= ym_pin;
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#else
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digitalWrite(_xp, LOW);
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digitalWrite(_ym, HIGH);
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#endif
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int z1 = analogRead(_xm);
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int z2 = analogRead(_yp);
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if (_rxplate != 0) {
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// now read the x
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float rtouch;
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rtouch = z2;
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rtouch /= z1;
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rtouch -= 1;
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rtouch *= x;
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rtouch *= _rxplate;
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rtouch /= 1024;
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z = rtouch;
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} else {
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z = (1023 - (z2 - z1));
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}
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if (!valid) {
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z = 0;
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}
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return TSPoint(x, y, z);
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}
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TouchScreen::TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym,
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uint16_t rxplate = 0) {
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_yp = yp;
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_xm = xm;
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_ym = ym;
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_xp = xp;
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_rxplate = rxplate;
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#if defined(USE_FAST_PINIO)
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xp_port = portOutputRegister(digitalPinToPort(_xp));
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yp_port = portOutputRegister(digitalPinToPort(_yp));
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xm_port = portOutputRegister(digitalPinToPort(_xm));
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ym_port = portOutputRegister(digitalPinToPort(_ym));
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xp_pin = digitalPinToBitMask(_xp);
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yp_pin = digitalPinToBitMask(_yp);
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xm_pin = digitalPinToBitMask(_xm);
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ym_pin = digitalPinToBitMask(_ym);
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#endif
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pressureThreshhold = 10;
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}
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/**
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* @brief Read the touch event's X value
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*
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* @return int the X measurement
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*/
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int TouchScreen::readTouchX(void) {
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pinMode(_yp, INPUT);
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pinMode(_ym, INPUT);
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digitalWrite(_yp, LOW);
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digitalWrite(_ym, LOW);
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pinMode(_xp, OUTPUT);
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digitalWrite(_xp, HIGH);
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pinMode(_xm, OUTPUT);
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digitalWrite(_xm, LOW);
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return (1023 - analogRead(_yp));
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}
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/**
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* @brief Read the touch event's Y value
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*
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* @return int the Y measurement
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*/
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int TouchScreen::readTouchY(void) {
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pinMode(_xp, INPUT);
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pinMode(_xm, INPUT);
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digitalWrite(_xp, LOW);
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digitalWrite(_xm, LOW);
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pinMode(_yp, OUTPUT);
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digitalWrite(_yp, HIGH);
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pinMode(_ym, OUTPUT);
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digitalWrite(_ym, LOW);
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return (1023 - analogRead(_xm));
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}
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/**
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* @brief Read the touch event's Z/pressure value
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*
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* @return int the Z measurement
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*/
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uint16_t TouchScreen::pressure(void) {
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// Set X+ to ground
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pinMode(_xp, OUTPUT);
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digitalWrite(_xp, LOW);
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// Set Y- to VCC
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pinMode(_ym, OUTPUT);
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digitalWrite(_ym, HIGH);
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// Hi-Z X- and Y+
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digitalWrite(_xm, LOW);
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pinMode(_xm, INPUT);
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digitalWrite(_yp, LOW);
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pinMode(_yp, INPUT);
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int z1 = analogRead(_xm);
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int z2 = analogRead(_yp);
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if (_rxplate != 0) {
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// now read the x
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float rtouch;
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rtouch = z2;
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rtouch /= z1;
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rtouch -= 1;
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rtouch *= readTouchX();
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rtouch *= _rxplate;
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rtouch /= 1024;
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return rtouch;
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} else {
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return (1023 - (z2 - z1));
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}
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}
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